func leaveIPv4Group(fd int, ifi *net.Interface, grp net.IP) error {
mreqn := syscall.IPMreqn{Multiaddr: [4]byte{grp[0], grp[1], grp[2], grp[3]}}
if ifi != nil {
mreqn.Ifindex = int32(ifi.Index)
}
return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreqn(fd, ianaProtocolIP, sysSockoptLeaveGroup, &mreqn))
}
func setIPv4MulticastInterface(fd int, ifi *net.Interface) error {
var mreqn syscall.IPMreqn
if ifi != nil {
mreqn.Ifindex = int32(ifi.Index)
}
return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreqn(fd, ianaProtocolIP, sysSockoptMulticastInterface, &mreqn))
}
func setIPv4MulticastInterface(fd int, ifi *net.Interface) error {
mreqn := syscall.IPMreqn{}
if ifi != nil {
mreqn.Ifindex = int32(ifi.Index)
}
return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreqn(fd, ianaProtocolIP, syscall.IP_MULTICAST_IF, &mreqn))
}
func joinIPv4Group(fd int, ifi *net.Interface, grp net.IP) error {
mreqn := &syscall.IPMreqn{Multiaddr: [4]byte{grp[0], grp[1], grp[2], grp[3]}}
if ifi != nil {
mreqn.Ifindex = int32(ifi.Index)
}
err := syscall.SetsockoptIPMreqn(fd, syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreqn)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
func setIPv4MulticastInterface(fd int, ifi *net.Interface) error {
mreqn := &syscall.IPMreqn{}
if ifi != nil {
mreqn.Ifindex = int32(ifi.Index)
}
err := syscall.SetsockoptIPMreqn(fd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreqn)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
var v int32
if ifi != nil {
v = int32(ifi.Index)
}
mreq := &syscall.IPMreqn{Ifindex: v}
if err := fd.incref(); err != nil {
return err
}
defer fd.decref()
return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreqn(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreq))
}
